Mump 1106 22 Install Bolt On Fuel Injection Fuel Layout

This is a basic layout of the Holley Avenger EFI system, but it could apply to any fuel injection system. There are two lines for pressure and return. Any unused fuel under pressure is regulated at the return line after the injectors to both control fuel pressure and get fuel back to the tank. Pressure line is 3⁄8-inch while return is 5⁄16-inch.